EROSION CONTROL MEASURES ALONG ARIYALUR BYPASS OF NH, TAMIL NADU

To address erosion control, Maccaferri has supplied biodegradable erosion control mat (woven coir mat (BioMac CCW)) and hydraulically applied erosion control measures (MacFlex HP FGM (HECP), MacGanics BSM (top soil alternative) and agronomic amendments, along with seeds). The top anchoring of mat is done with cement concrete blocks at the crest. Suitably designed chute drains are also constructed at stipulated intervals along the slope. Agronomic soil tests have been conducted to determine the soil nutrients condition to measure soil’s ability to supply essential elements to seeds, to recommend the suitable solution, amendment to improve the soil and to ensure appropriate plant species selection. The seed species are selected based on the soil type present at site, pH, climate, type of planting, availability of local seeds and discussions with a horticulturist. After the site preparation, the soil slope has been covered with a layer of fertile soil and filled all the cuts and gullies present locally. The quantities of various components are finalized before mixing in a hydroseeder along with seeds and water in a two step process. The mixed slurry has been sprayed over the slope surface and maintenance has been done by spraying water on the slope to avoid drying of the material. Soon after the application of erosion control measures at site, the applied systems started showing the performance with respect to erosion control of the embankment slope (ie, vegetation coverage). The successful germination has started within few weeks and grasses have been visible on the treated slope. Proper maintenance of the treated areas was mandatory to ensure the effectiveness of the system.